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A Ball Mill Critical Speed (actually ball, rod, AG or SAG) is the speed at which the centrifugal forces equal gravitational forces at the mill shell’s inside ...

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The critical speed of ball mill is given by, where R = radius of ball mill; r = radius of ball. For R = 1000 mm and r = 50 mm, n c = 30.7 rpm.

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Ball Mill Operating Speed - Mechanical Operations … The critical speed of ball mill is given by, where R = radius of ball mill; r = radius of ball.

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This formula calculates the critical speed of any ball mill. Most ball mills operate most efficiently between 65% and 75% of their critical speed.

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Oct 9, 2016 As the mill speed is increased (or lifters installed) the balls are lifted higher To calculate a ball mill's critical speed use the following equation:.

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This formula calculates the critical speed of any ball mill. Most ball mills operate most efficiently between 65% and 75% of their critical speed.